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Massey-Ferguson 35 Idle Issue

H

homestead222

New User
Hey all,
I have a 1964 Massey-Ferguson 35 that I inherited from my grandfather. For the most part it runs pretty well, except that it idles too high. According to the manual, it should idle at 450rpm. The lowest that it will currently go is 1000-1200. I've adjusted the idle screw as far as it goes. Been scratching my head over this for quite a while, but haven't gotten anywhere. Any suggestions would be greatly appreciated.
Josh
 
you said you screwed the the idle as far as it will go are you talking about the mixture screw or the the idle setting you should be able to turn out the idle screw out far enough to kill the engine in combination with the mixture screw if not remove the linkage to make sure its not hanging up
 
The idle screw on the carb should be set at 1.5 turns out and left along for the most part. On the linkage area of the carb you should see another idle adjustment screw that is what you need to adjust to get your RPM down
 
Per the manual, there's an "Idling - air adjustment", an "Idling - speed adjustment", and a "Main jet adjustment" on the carb. I've set the air and main jet to what the manual recommends, and the idle speed I've backed all the way out. I've messed with the linkage and it's free. One thing that I've noticed is that the idle speed screw is different than the one pictured in the manual. Are there problems I should be aware of with possible replacement parts?
 
If that is so can you take and grab the governor to carb rod and push it so it will idle lower?? If you can good chance the linkage it self needs to be adjusted
 
Okay all I'm seeing is one screw having to do with idle. It's on the back of the carb. There's a pin that comes out of the carb that the screw hits as a stop. Where is the other one?
 

It sounds like it could be sucking air at one of the carburetor shafts or at carb to manifold or manifold to head, making it run lean and faster. Try turning the air screw, or low speed mixture, well in for less air to see if that brings the speed down any. You can also try spraying some WD-40 at the above mentioned places, and see if that makes it speed up any.
 
like has been said I would spray brake clean or carb clean around the carb and see if the idle goes up shaft seals might be gone
 
Okay, just gave the WD-40 a try and didn't notice any change in the rpms. The air screw doesn't seem to have
much affect on the rpm, but how smooth it runs.
 
don't worry what the manual says about 1-1/2 turns turn the low speed mixture in till it starts to slow then back out 1/4 to a 1/2 turn the main is the same way driving under load if you pull the choke out just a tad and it picks up or smoooths out its lean turn your main out 1/2 turn
 
(quoted from post at 11:57:47 03/03/18) don't worry what the manual says about 1-1/2 turns turn the low speed mixture in till it starts to slow then back out 1/4 to a 1/2 turn the main is the same way driving under load if you pull the choke out just a tad and it picks up or smoooths out its lean turn your main out 1/2 turn
Click to expand...

Sorry, which one are you referring to as the low speed mixture? Idle speed adjustment?
 
no the mixture screw not the one that has linkage attached to it -- if you can send a pic it would help
 

FIXED!!! Okay, it was that the butterfly valve wasn't getting closed far enough. Messed with that a bit and got the rpms right down where they should be. Many thanks to everyone for all the suggestions. Especially ADB-Ia and old for suggesting that.
Josh
 
Glad you got it. Not idling down bugs me. I had a hired man who would leave the tractor running half, three quarter, or even full speed when he got off at times. Drove me crazy.
We would be yelling, trying to converse over the roar. I said something several times but it didn't do much good. He was the best hired man I ever hired, though. ADB
 
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